net/i40e: fix i40evf MAC filter table

net/i40e: fix i40evf MAC filter table

The i40e maintains a single MAC filter table for both
unicast and multicast addresses.  The i40e_validate_mac_addr
function was preventing multicast addresses from being added
to the table via i40evf_add_mac_addr.  Fixed the issue by
adjusting the check in i40evf_add_mac_addr.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Fixes: 97ac72aa71a9 ("i40e: support setting VF MAC address")
Cc: stable@dpdk.org
Signed-off-by: David Harton <dharton@cisco.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>